I wouldn't waste time doing the parasite cleanse.
**edit** (I mean to say, don't waste time, get on it without delay!!)
Also - I know you're concerned with your weight - look into an elemental diet. Not that weight loss shake crap, but a true, easily assimilated, powder-form shake. It will contain a broken-down protein (amino acids), a broken-down carbohydrate (such as tapioca starch), and all the vitamins and minerals your body NEEDS for the day. Some come with added fat, some without (you can add your own if needed).
I actually bought Absorb Plus to use because I heard it tasted better than the Vivonex stuff, and because I could get it unsweetened, among other reasons. I want to be able to add my own fat in the form of flax oil, etc.
You could make your own, but that would be pricey too. You'd just have to assemble it on your own and drink it 5-6 times a day. Being pre-digested, your body could easily get the nutrients in your upper small intestine and there would be nothing, no "food", for parasites or yeasts down below. You'd basically starve them.
That way you're still fed and nourished. This is what they do in hospitals when people are too sick to eat or are too thin/frail to hit themselves with potent herbs. It's also called a low-residue diet.
I'm sure if money is an issue, you could hire yourself out for babysitting, cleaning, or dog-walking -- safely, of course. Then run to the nearest whole foods store and buy some whole foods that will make you whole!
Let us know how your night goes! Sending good thoughts your way!